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From: Mick <michaelkintzios@gmail.com>
To: gentoo-user@lists.gentoo.org
Subject: Re: [gentoo-user] {OT} Cable latency & Skype
Date: Tue, 13 Nov 2007 14:15:10 +0000
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On Tuesday 13 November 2007, Mark Shields wrote:
> On Nov 12, 2007 6:59 PM, Grant <emailgrant@gmail.com> wrote:
> > I just switched from DSL to cable and I'm noticing a significant delay
> > when using Skype, even when nothing else is happening on my network.
> > Has anyone else noticed this and had success "fixing" it? I'm using a
> > Gentoo router so I can try just about anything.
> >
> > - Grant
> > --
> > gentoo-user@gentoo.org mailing list
>
> I work for as a cable modem technician. The first thing to check for when
> you're having cable internet problems is the modem. Call up tech support
> and ask them to check the signals on the modem (upstream power, downstream
> rcv, downstream SNR, upstream SNR, headend receive) and make sure they're
> in range. Also ask them to ping and (if available) rf ping to check for
> latency/packet loss. Also ask them to check the circuits/backbone. Also,
> can you reproduce this latency in the form of a ping/traceroute? This wi=
ll
> go a long way with ISPs in determining where the problem is (although
> Comcast just blows off high latency on pings as the result of dropping th=
em
> due to lower priority).
Interesting to hear this. The OP will no doubt have a different traceroute=
to=20
show the ISP, but does the comment on dropping pings explain the % loss sho=
wn=20
below in certain hops, or is it just a matter of overloaded switches?
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
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=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
HOST: lappy Loss% Snt Last Avg Best Wrst StDev
5. 217.41.177.66 0.0% 15 17.9 18.0 15.7 22.8 1.7
6. 217.41.177.134 6.7% 15 21.0 17.5 15.7 21.0 1.5
7. 217.41.177.54 0.0% 15 17.0 16.6 15.1 20.7 1.4
8. 217.47.166.106 0.0% 15 16.0 16.9 15.3 18.9 1.1
9. core1-pos5-2.faraday.ukcore. 0.0% 15 17.0 45.3 15.2 192.3 52.7
10. core1-pos0-15-0-10.ilford.uk 0.0% 15 18.9 18.3 17.1 19.5 0.7
11. 194.74.77.222 0.0% 15 18.1 17.1 15.5 19.1 1.0
12. t2c1-ge14-0-0.uk-ilf.eu.bt.n 6.7% 15 17.9 17.3 15.7 19.1 0.9
13. t2c1-p4-0-0.us-nyc.eu.bt.net 0.0% 15 107.3 108.1 106.1 109.7 1.1
14. 12.116.102.17 0.0% 15 108.3 107.9 105.5 110.0 1.3
15. tbr1.n54ny.ip.att.net 0.0% 15 133.2 133.8 131.2 135.4 1.4
16. cr2.n54ny.ip.att.net 0.0% 15 135.2 133.5 131.6 135.7 1.3
17. cr2.wswdc.ip.att.net 0.0% 15 132.2 132.9 131.3 134.7 1.1
18. cr1.attga.ip.att.net 0.0% 15 134.2 133.6 132.1 135.7 1.2
19. tbr2.attga.ip.att.net 0.0% 15 135.2 134.0 132.0 136.2 1.3
20. gar4.attga.ip.att.net 0.0% 15 132.2 134.1 130.0 159.4 7.1
21. 12.124.64.62 20.0% 15 140.2 138.6 137.0 140.4 1.1
22. te-9-1-ur01.south.tn.knox.co 6.7% 15 141.2 140.4 138.1 141.5 1.0
23. te-8-3-ur02.west.tn.knox.com 0.0% 15 141.2 140.3 139.1 141.2 0.6
24. ge-1-46-ur01.west.tn.knox.co 0.0% 15 138.2 138.6 137.8 140.6 0.9
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
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Note some of these are being dropped in the UK, rather than by Comcast.
=2D-=20
Regards,
Mick
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